Single 1 Racing Seat Slider Rail Track Kit For Car/Truck/Suv Sparco Nrg P3 Black for Mazda Miata Fits most aftermarket racing seats (Sickspeed , NRG, Sparco). High quality construction for a permanent solution Total extended length is 17 1/32" (432.6mm) Closed length is 14 3/16" (360.4mm) Can slide forward and back 3 5/8" (92.1mm) each way